49491 has 20 divisors (see below), whose sum is σ = 81312. Its totient is φ = 29808.

The previous prime is 49481. The next prime is 49499. The reversal of 49491 is 19494.

It is not a de Polignac number, because 49491 - 2⁵ = 49459 is a prime.

It is a super-3 number, since 3×49491³ = 363663690833313, which contains 333 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (1296) is a multiple of the sum of its prime factors (72).

It is not an unprimeable number, because it can be changed into a prime (49499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1030 + ... + 1076.

2⁴⁹⁴⁹¹ is an apocalyptic number.

49491 is the 141-st heptagonal number.

49491 is a deficient number, since it is larger than the sum of its proper divisors (31821).

49491 is a wasteful number, since it uses less digits than its factorization.

49491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 63 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 49491 is about 222.4657276975. The cubic root of 49491 is about 36.7148768964.

It can be divided in two parts, 4949 and 1, that added together give a triangular number (4950 = T₉₉).

The spelling of 49491 in words is "forty-nine thousand, four hundred ninety-one".